HVAC-Talk site will be slow for the next few days. It's normal site/server maintenance. Thx -Dad

Welcome to HVAC-Talk.com, a non-DIY site and the ultimate Source for HVAC Information & Knowledge Sharing for the industry professional! Here you can join over 150,000 HVAC Professionals & enthusiasts from around the world discussing all things related to HVAC/R. You are currently viewing as a NON-REGISTERED guest which gives you limited access to view discussions

To gain full access to our forums you must register; for a free account. As a registered Guest you will be able to:

Participate in over 40 different forums and search/browse from nearly 3 million posts.

Running the fan 24/7 can potentially even temperatures out in a house, especially in two story applications. In essence you are homogenizing the air.

However, it's often a bad idea for a number of reasons. Many duct systems leak excessively causing artificially high infiltration any time the fan runs. That drives outdoor humidity, contaminants and whatever else inside. And if you only have one or two returns then any bedroom that has a closed door will also cause pressurization issues, which has a similar effect.

The bottom line is that some people in some instances will perceive improved comfort by running the fan. But many get just the opposite. And unless you have an unusually tight duct system with good return placement, the odds are good that you'll increase your bill.